Musannaf Ibn Abi Shaybah

Hazrat Qatadah was asked that if a person covers only his nose during prayer, what is the ruling on this? He replied that Hazrat Ikrimah has narrated that Hazrat Ibn Abbas (may Allah be pleased with them) considered it disliked. Hazrat Qatadah says that Hazrat Saeed bin Musayyib, Hazrat Nakha'i, and Hazrat Ata also considered it disliked. Hasan did not see any harm in it. Hazrat Qatadah says that I do not see any harm in covering the mouth.

Hazrat Abu Alia considered it undesirable to cover the nose during prayer.

Hazrat Hammad has considered it undesirable.

Hasan considered it undesirable that both the nose and mouth be covered during prayer. However, there is no harm in covering only the mouth, leaving the nose uncovered.